Hi Everyone! One additional feature is making its debut in the 2.1 release: API Access. The solution now includes an ASMX Web Service which will be used to expose a variety of functionality. First off is the ability to create new posts to your feed or a group feed with the PostToChatter method. It will use the calling user’s access token to create a feed item in Chatter – so yes, all calls to the web service must be authenticated.
Additional methods and properties will be made available in future releases. Check out the updated documentation when released for more details and examples. Thanks for using Chatter for SharePoint!